Stroke-indicator.



No. 799,545. PATENTED SEPT. 12, 1905, T. C. BILL.

STROKE INDIGATOR.

- APPLICATION FILED OCT. 26,1904- Wmlyfi? E E .ZTLUWZOTB fit-4 4 Ma. Tmdmw UNITED STATES PATENT oi rion.

STROKE-INDICATOR.

Specification of Letters Patent.

Patented Sept. 12, 1905.

Application filed October 26, 1904. Serial No. 230,095.

To (Ml 107mm, it may concern: I

Be it known that I, THOMAS C. DILL, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Stroke-Indicators, of which the following is a specification.

My invention consists of a novel device for visually indicating the distance between the center of rotation of a crank-disk or equivalent device and the center of an adjustable crank-pin thereon, towhich is attached a connecting rod or link, the device contemplating more particularly the provision of a relatively simple and inexpensive structure for use on a slotter or like machine for correctlyindicating the distance of the crank-pin from the center line or axis of the crank-disk, and consequently the length of stroke of the toolcarrying head operated from said parts.

The objects above'noted I attain as hereinafter set forth, reference being had to the accompanying drawings, in which- Figure 1 is a front elevation of the crankdisk of a slotter, showing an adjustable conriection between it and the connecting rod or link attached to the reciprocating tool-head and illustrating the application thereto of my stroke-indicator. Fig. 2 is a fragmentary side elevation of a portion of the structure shown in Fig. 1, further illustrating my invention; and Figs. 3, 4, and 5 are modified forms of myinvention.

In the above drawings, A is the crank-disk of a slotter or similar machine, to which is adjustably attached one end of a link or connecting-rod B, whose opposite end is attached to the ram or tool head. Inorder to give this head any desired length of stroke, it is customary to provide an undercut slot on the crank-disk and to place therein a sliding block Z), upon which is carried a crank-pin b for the reception of the end of the connecting-rod B, there being preferably also abushing 6 upon said pin. In order to give the end of the connecting-rod any desired length of stroke, a screw (J is provided with suitable bearings in the crank-disk and is threaded through the block b, it being possible to rotate the screw and thereby move the crank-pin 6 toward or from the center of the disk by means of a suitable wrench applied to the square end 0 of said screw.

In order to indicate the distance of the crank-pin I) from the center line of the crank, and consequently the length of the stroke of the tool-head, I provide a lever D, pivoted to the face of the crank-disk and having one arm d so curved that its opposite end d, which is shaped to serve as a pointer or indicator, will move through substantially equal angles for each unit of distance traveled by the crankpin 5 toward or from the center line of the disk A. The curved edge of the arm dis continually pressed against some part of the adjustable crank-pin-in the present instance, the edge of the bushing for the connecting-rod D- by means of a spring E, and the edge of the disk A is provided withascale, as shown in Fig. 2, preferably graduated to give a direct reading of the length of the stroke of the tool-head corresponding to any given distance of the crank-pin from the center of the disk A. It will be seen that as the screw C is turned to move the block I) away from the center of the disk, the spring E by pressing the curved edge of the lever D against the bushing b will cause the lever D to turn on its pivot, so that if, for example, it be desired that the tool-head shall have a length of stroke of, say, eight inches, such turning of the screw is continued until the end of the indicatingarm d points to the finger 8 on the scale upon the edge of the crank-disk.

While I have illustrated my invention as applied to a connecting-rod and crank-disk of a slotting-machine, there is no reason why it cannot be applied to any other machine having an adjustable crank.

If it be desired, the spring E may be dispensed with by making the lever, as shown at D in Fig. 3, so that one of its arms is forked to extend around the crank-pin or the bushing thereof. In this case the edges of the forks in engagement with the pin are formed to the same curve as that of the arm (Z in Fig. 1, the lever thereby being made to move whenever the crank-pin is moved, as above described.

If it is not essential that the divisions of the indicating-scale be uniform, the lever may, as shown at D in Fig. 4, be made as a straight bar, in which case the said scale is graduated, so that the pointer will give proper readings as the the crank-pin is moved toward or from the center.

In Fig. 5 is shown still another construction, by which an adjustable crank-pin may be made to give visual indication of its distance from the center line of the crank. In this instance there is a toothed wheel 0Z loosely mounted on the crank-pin, though eccentric to the center line thereof. The arm IIO (1* of the lever D is provided with teeth which are held in engagement with said toothed wheel by means of a spring E. As the pin is moved from the center line of the crank the engagement of the rack with the wheel (Z causes this latter to revolve on the crank-pin, and thereby permits the rack to be turned on its pivot under the action of its spring. It will of course be understood that the gear is so mounted on the crank-pin and is so proportioned that the movement of the pointer end of the lever D correctly indicates on its suitably-graduated scale the distance of said pin from the center of revolution of the crank or the length of stroke of the tool-head, as may be desired) I claim as my invention 1. The combination of a crank having a pin and provided with ascale, a lever mounted on the crank and movable on its fulcrum by said pin, means other than the lever for adjusting the pin toward and from the center of the crank, said lever cooperating with the scale whereby the distance of the pin from the axis of the crank is indicated, substantially as described.

2. The combination of a crank provided with a scale, a link having one end connected to the crank so as to be adjustable toward and from the axis of revolution thereof, a lever pivoted to the crank and operatively engaging said end of the link, said lever cooperating with the scale to indicate the distance of the end of the link from said axis, substantially as described.

3. The combination of a crank having an adjustable pin and provided with a scale, a lever on the crank having one arm in operative connection with the pin and a second arm constructed to serve as a pointer, substantially as described.

4:. The combination of a crank having an adjustable pin and provided with a scale, a lever on the crank having an arm in operative connection with the pin, a second arm constructed to serve as a pointer and cooperating with the scale, with means acting to maintain the first arm in operative connection with said pin, substantially as described.

5. The combination of a crank having-a pin for the connection of a rod and provided with a scale, means for adjusting the pin toward and from the axis of the crank, a lever pivoted to said crank, a spring acting on the lever to maintain one arm thereof in operative connection with the pin, said lever cooperating with the scale to indicate the distance of said pin from the axis of the crank, substantially as described.

6. The combination of a crank having a pin for the connection of a rod, means for adjusting the pin toward and from the axis of the crank, and mechanism in addition to said adjusting means, including a lever, coacting with the pin for indicating the distance of said pin from the axis of the crank, substantially as described.

7. The combination of a crank provided with a scale, a screw carried in hearings on the crank, a pin threaded on said screw, a link connected to the pin, a lever having a curved and a pointed arm, said latter arm c0- operating with the scale, and a spring for causing the curved arm to bear against the pin, substantially as described.

8. The combination of a crank provided with a scale, a screw carried in bearings on the crank, a pin threaded on said screw, a link connected to the pin, a lever having a curved and a pointed arm, said latter arm cooperating with the scale on the crank, a spring for causing the curved arm to bear against the pin, the curve of said first arm being so proportioned that movement of the pin through equal distances causes uniform an gular movements of the pointed arm, substantially as described.

9. The combination of a crank, an adjustable pin thereon, and a pointer having a portion in direct engagement with the pin, said pointer being so constructed that each unit of distance moved through by the pin causes equal angular movements of said pointer, substantially as described.

In testimony whereof l have signed my name to this specification in the presence of two subscribing witnesses.

THOMAS C. DILL.

Witnesses:

WALTER GHIsM, Jos. H. KLEIN. 

